Treadmill versus street

Strangely enough I did a treadmill yesterday for an hour because I wanted to avoid impact. Still not sure whether it was harder or whatever... i didn't use proper shoes because it was impromptu session when I was down the gym but I found that I wasn't keeping my usualy pace. I run at a fair pace and I think it is harder to get a proper running posture on a treadmill...
 
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